Airtel — whatsmob fraud

Airtel's loyal customer since 2009. And still they loot me for a mere 150rs. That's the only balance i had in my phone. The customer care said i clicked a link and it got activated without any confirmation. How can they let a third party with this much freedom? Customer care lady also said they don't need our measely money. But still they steal from us.
I never thought would say this, but i think i will port to another telecom network where they will be happy to have me.